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For questions concerning electromagnetic radiation in the visible spectrum.

31 votes
Accepted

What are the main problems with beaming light from the Sun to Saturn?

The light beam will always be at least as wide, or wider. … When you use optics to move light from a light source, and project it somewhere else, the smallest you can make the projected light is when you attain an image of the light source that is in perfect focus …
MichaelK's user avatar
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21 votes
Accepted

Would it be possible to build a powerless holographic projector?

Mirrors work fine ...as the Norwegian town of Rjukan has already demonstrated. Read about it here. The villages of Rjukan, Norway, and Viganella, Italy, are both situated in deep valleys where mounta …
MichaelK's user avatar
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3 votes

Effects of a Moon-sized Sun-Cannon on Earth

Due to mechanical orientation errors, and small imperfections the light is not concentrated into a dot, but into a small circle of about 3 kilometers diameter and with a gaussian distribution of sunlight …
MichaelK's user avatar
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3 votes

A monochrome planet

Not unless you invent an atmosphere that permits only one (narrow band of) wavelength of light to pass through it and that effectively absorbs everything else, or invent a LED/laser-star. …
MichaelK's user avatar
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0 votes

Can a theoretical case be made for "transporting" consciousness via light?

Light — as we know — can carry data. So the answer to your question is: yes, consciousness can be transported via light. …
MichaelK's user avatar
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